I did a sz 98. I had epic FAIL on this top x2, both with a super stretchy knit, on trying to get that button band attached and looking reasonably nice at all. I threw away the first top totally a few months ago and tried again today. The first shirt front went in the trash. I did my own modification on the next round:

I cut the whole shirt on the fold but marked where the stitching line would have been. I sewed on the stitching line, which in effect created a huge dart in the front. Then I gathered that up (still not cut). So I never cut the front of the shirt under the band but did gather it. I created the "band" out of a separate piece, folded under the raw edges and topstitched it on the shirt. I trimmed the back where the "dart" was to reduce bulk. So I have a faux button band on there.

I used FOE on the neckline and sleeve edges.